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R30605 Cobalt vs. ASTM A356 Grade 9

R30605 cobalt belongs to the cobalt alloys classification, while ASTM A356 grade 9 belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is ASTM A356 grade 9.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
17
Fatigue Strength, MPa 260 to 590
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
670
Tensile Strength: Yield (Proof), MPa 470 to 1600
460

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1330
1430
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 9.6
41
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.6

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
2.4
Embodied Energy, MJ/kg 140
33
Embodied Water, L/kg 450
56

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 33 to 55
24
Strength to Weight: Bending, points 25 to 36
22
Thermal Diffusivity, mm2/s 2.5
11
Thermal Shock Resistance, points 31 to 52
19

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.2
Chromium (Cr), % 19 to 21
1.0 to 1.5
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
95.2 to 97.2
Manganese (Mn), % 1.0 to 2.0
0.5 to 0.9
Molybdenum (Mo), % 0
0.9 to 1.2
Nickel (Ni), % 9.0 to 11
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.4
0.2 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0
0.2 to 0.35